TALANTA
·
2023
·
IF 6.1
Jingyu Li,Miao Liu,Jiaxuan Li,Xianhua Liu
The establishment of simple and sensitive detection methods for fluoride ion (F − ) is of great importance for its effective prevention and control, and metal-organic framework (MOF) has attracted much attention for sensing applications due to its high surface areas and tunable structures. Herein, we successfully synthesized a fluorescent probe for ratiometric sensing of F − by encapsulating sensitized Tb 3+ in a MOF-on-MOF material (UIO66/MOF801, with the formula of C 48 H 28 O 32 Zr 6 and C 24 H 2 O 32 Zr 6 , respectively). We found that Tb 3+ @UIO66/MOF801 can be used as a built-in fluorescent probe for fluorescence-enhanced sensing of F − . Interestingly, the two fluorescence emission peaks of Tb 3+ @UIO66/MOF801 at 375 nm and 544 nm exhibit different fluorescence responses to F − under excitation at 300 nm. The 544 nm peak is sensitive to F − , while the 375 nm peak is insensitive to it. Photophysical analysis indicated that the photosensitive substance was formed, which promotes the absorption of 300 nm excitation light by the system. Self-calibrating fluorescent detection of F − was achieved due to the unequal energy transfer toward the two different emission centers. The detection limit of Tb 3+ @UIO66/MOF801 for F − was 4.029 μM, which is far lower than the WHO guideline for drinking water . Moreover, the ratiometric fluorescence strategy showed a high concentration tolerance of interference, because of its inner-reference effect. This work highlights the high potential of lanthanide ion encapsulated MOF-on-MOF as environmental sensors, and offers a scalable way for construction of the ratiometric fluorescence sensing systems.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Small
·
2023
·Vol. 19
·期 38
·2302055
·
IF 13.3
Chaojie Lyu,Yanle Li,Jiarun Cheng,Yuquan Yang,Kaili Wu,Jiwen Wu,Huichao Wang,Woon-Ming Lau,Ziqi Tian,Ning Wang,Jinlong Zheng
Heteroatoms Fe, F co-doped NiO hollow spheres (Fe, F-NiO) are designed, which simultaneously integrate promoted thermodynamics by electronic structure modulation with boosted reaction kinetics by nano-architectonics. Benefiting from the electronic structure co-regulation of Ni sites by introducing Fe and F atoms in NiO , as the rate-determined step (RDS), the Gibbs free energy of OH* intermediates (Δ G OH* ) for Fe, F-NiO catalyst is significantly decreased to 1.87 eV for oxygen evolution reaction (OER) compared with pristine NiO (2.23 eV), which reduces the energy barrier and improves the reaction activity. Besides, densities of states (DOS) result verifies the bandgap of Fe, F-NiO(100) is significantly decreased compared with pristine NiO(100), which is beneficial to promote electrons transfer efficiency in electrochemical system. Profiting by the synergistic effect, the Fe, F-NiO hollow spheres only require the overpotential of 215 mV for OER at 10 mA cm −2 and extraordinary durability under alkaline condition. The assembled Fe, F-NiO || Fe-Ni 2 P system only needs 1.51 V to reach 10 mA cm −2 , also exhibits outstanding electrocatalytic durability for continuous operation. More importantly, replacing the sluggish OER by advanced sulfion oxidation reaction (SOR) not only can realize the energy saving H 2 production and toxic substances degradation, but also bring additional economic benefits.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2022
·
IF 5.304
Honglin Qin,Yuan Tao,Ruiting Niu,Bingyan Han,Lizhen Qiao
In this work, magnetic flower-like and fluorine-doped nickel oxide composites Fe 3 O 4 @SiO 2 @F/NiO were prepared and applied for the magnetic solid-phase extraction (MSPE) of five imidazole fungicides. The obtained materials were characterized by scanning electron microscopy, X-ray diffraction, energy-dispersive X-ray photoelectron spectroscopy and Brunauer-Emmett-Teller analysis to verify the successful synthesis. The effect of some experimental parameters on the extraction efficiency were explored to optimize the MSPE conditions, including the adsorbent dosage, ultrasonic time, salt concentration, sample solution pH, elution solvent type and volume. Then, method validation was performed under the optimal conditions in combination with high-performance liquid chromatography-ultraviolet detection. The determination coefficients ranged from 0.9956 to 0.9991, and the limits of detection and limits of quantification for the imidazole fungicides were 0.1–3 μg·L −1 and 0.3–10 μg·L −1 , respectively. Moreover, the intra-day and inter-day precisions were evaluated in three different concentrations with relative standard deviations in the range of 1.34 %-13.31 % and 4.96 %-13.92 %. At last, the proposed MSPE method was used to enrich and determine imidazole fungicides in tap water, milk and green tea samples, and the spiked recoveries were in the range of 77.93 %-119.38 %, demonstrating the potential of the method in the determination of imidazole fungicides from real samples.
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2020
·
IF 4.231
Yufei Liu,Siyuan Jiang,Wei Yan,Jun Qin,Min He,Shuhao Qin,Jie Yu
Improving complexation at the interfaces and regulating the crystal transformation behaviors of polyamide 6 (PA6) composites with high mechanical and thermal properties are essential for the industrial applications of PA6. In this work, the effects of adding p (N-(4-F-phenylmaleimide)-alt-styrene) (PFS) on the crystal transformation, thermostability, thermal conductivity , and mechanical properties of PA6 were investigated and discussed systematically. The resu---lts from heat deflection temperature (HDT), dynamic mechanical analysis (DMA ) and thermal conductivity tests indicate that PFS greatly increases the HDT, glass-transition temperature ( T g ), and thermal conductivity of PA6. Simultaneously, when the content of PFS is 10%, the tensile strength and flexural moduli of PA6/PFS composites are increased by 10.5 and 17.8% compared with that of pure PA6, respectively. The results from differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) show that PFS induces the transformation of PA6 from γ to α crystals by interfacial complexation. This work offers a facile approach for producing materials with high thermal and mechanical performances that can be potentially used in automobiles, electronics, and related technologies.
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 26
·10554-10559
·
IF 3.069
Xuelei Pang,Junqi Ge,Xudong Yu,Yajuan Li,Fengjuan Shen,Yanqiu Wang,Jujie Ren
A novel fluorescent organogelator (Y1) with both photoinduced electron transfer (PET) and intramolecular charge transfer (ICT) characteristics was designed and synthesized. The gelator Y1 could selectively recognize and discriminate fluoride and acetate ions in both solution and gel systems. Interestingly, addition of F− to the Y1 solution resulted in a dramatic enhancement of the fluorescence intensity and an obvious change in fluorescence color. However, the fluorescence intensity and color of the Y1 solution were strongly dependent on time after the addition of OAc−. Moreover, the organogel treated with F− experienced a quick gel-to-sol transition, while only color and fluorescence changes were observed without gel collapse after adding OAc− to the gel system. The sensing mechanisms were studied by 1H NMR, SEM and spectroscopic experiments.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2014
·Vol. 2
·期 28
·5651-5659
·
IF 0
Ling Fan,Ruili Cui,Xiuping Guo,Dong Qian,Beibei Qiu,Jun Yuan,Yongfang Li,Wenlong Huang,Junliang Yang,Weifang Liu,Xinjun Xu,Lidong Li,Yingping Zou
A new alkylthienyl substituted thieno[2,3-f]benzofuran (TBF)-based polymer (PTBFTDTBT) was synthesized and characterized. PTBFTDTBT had a high molecular weight, good solubility in common organic solvents, broad visible absorption from 300 to 750 nm, and a relatively deep highest occupied molecular orbital level (−5.2 eV). PTBFTDTBT also showed a field hole mobility up to the order of 10−2 using an organic field effect transistor (OFET) method and an order of 10−2 using a space-charge-limited current (SCLC) method. With the structure of indium tin oxide (ITO)/poly(3,4-ethylenedioxythiophene):polystyrene sulfonate/PTBFTDTBT:PC71BM (1 : 2, w/w)/Ca/Al, a power conversion efficiency of 6.42% was obtained with a high short circuit current (Jsc) of 13.51 mA cm−2 and fill factor (FF) of 61%, under the illumination of AM1.5G, at 100 mW cm−2, without any post-treatment. The study demonstrates that TBF is a promising building block for organic electronics.
✓ 已验证
产品关联
DOI
Journal of Cleaner Production
·
2024
·
IF 9.7
Min Wang,Guanghua Lu,Runren Jiang,Tianjian Dang,Yufang Chen,Jianchao Liu,Zhenhua Yan,Jun Hou
The widespread use of bisphenol F (BPF) as the commonly used alternative to bisphenol A (BPA) in the industry and its hazardous effects on ecological system and human health have attracted widespread attention. In this study, V C -FCN 0.3 hollow nanotube structure with confinement space effects and combined carbon vacancies was constructed by the spatial self-corrosion strategy, which effectively addressed the inherent limitations of conventional carbon nitride and achieved 100% removal rate of BPF within 2 h under visible light. Carbon vacancies not only accelerated the transfer of photogenerated carriers, but also enhanced the adsorption and activation of oxygen that accelerating the production of ·O 2 − , the main active species in this system. In addition, the special spatial structure shortened the mass transfer distance between the target pollutants and the active species. What's more, V C -FCN 0.3 showed excellent, stable, and eco-friendly photocatalytic degradation of bisphenol F over a wide pH range and in five water matrices, contributing effectively to the solution of purification of wastewater containing bisphenol analogues.
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2024
·Vol. 15
·期 1
·1-12
·
IF 14.7
Ye Pengcheng,Fang Keqing,Wang Haiyan,Wang Yahao,Huang Hao,Mo Chenbin,Ning Jiqiang,Hu Yong
Oxygen evolution reaction (OER) is critical to renewable energy conversion technologies, but the structure-activity relationships and underlying catalytic mechanisms in catalysts are not fully understood. We herein demonstrate a strategy to promote OER with simultaneously achieved lattice oxygen activation and enhanced local electric field by dual doping of cations and anions. Rough arrays of Fe and F co-doped CoO nanoneedles are constructed, and a low overpotential of 277 mV at 500 mA cm −2 is achieved. The dually doped Fe and F could cooperatively tailor the electronic properties of CoO, leading to improved metal-oxygen covalency and stimulated lattice oxygen activation. Particularly, Fe doping induces a synergetic effect of tip enhancement and proximity effect, which effectively concentrates OH − ions, optimizes reaction energy barrier and promotes O 2 desorption. This work demonstrates a conceptual strategy to couple lattice oxygen and local electric field for effective electrocatalytic water oxidation.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MEASUREMENT
·
2024
·
IF 5.2
Bin Yin,Zhuxuan Jiang,Shilin Liu,Guofeng Sang,Yanzhi Lv,Muguang Wang,Shiying Xiao,Beilei Wu,Qichao Wang,Li Pei,Songhua Wu
A composite Fabry-Perot (F-P) fiber optic sensor based on the vernier effect is fabricated, and experiments confirmed that it can be used to simultaneously measure underwater temperature and pH. The fiber optic sensor fabricated with single mode fiber (SMF) − multi mode fiber (MMF) − seven core fiber (SCF) − quartz capillary tube (QCT) − no core fiber (NCF) structures has contained a silane coupling agent-polyvinyl alcohol/graphene oxide (SCA-PVA/GO) hybrid multilayer film to enhance the sensor performance. Two types of sensors are fabricated, one with a plane end face and another with a tapered end surface, which named as sensor 1 and sensor 2, respectively. Their performance are experimentally demonstrated. Within the temperature range of 15°C-35°C and the pH range of 7.55–9.21, the sensitivities of sensor 1 to temperature and pH are 82.94 pm/°C and 1.16 dB/pH, while the corresponding values of sensor 2 are 39.26 pm/°C and 0.4 dB/pH. Experimental results demonstrated that the sensitivities of sensor 1 to temperature and pH are higher than that of sensor 2. But compared with sensor 2, sensor 1 has higher values of crosstalk and random error. By contrast, sensor 2 maintain a good linear relationship with the environmental dual parameters, allowing for the simultaneous measurement of underwater temperature and pH. Moreover, both sensors demonstrate good stability and reversibility when the temperature and pH are varied. Furthermore, the pH response times of the two sensors are less than 0.5 s, with a recovery time of 2 s. Thus, the proposed sensors with outstanding stability, reversibility, repeatability, and rapid response times will have a broad range of applications in the fields of marine environment monitoring, water quality detection, and food and medical device safety testing.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2025
·
IF 5.5
Yu Hao,Dongfang Chen,Dongyi Pu,Song Hu,Pavese Doague Nguela,Pucheng Pei,Xiaoming Xu
The development of efficient and durable hydrogen evolution reaction (HER) electrocatalysts is critical for sustainable energy conversion. Although platinum (Pt) serves as a benchmark HER catalyst, its practical application is hindered by the high cost, limited durability, and susceptibility to CO poisoning. In this work, we report a heterojunction Pt-based catalyst, Pt@NCL-MXene, synthesized by LiF etching of MXene and subsequent NH3 calcination. This process introduces dual nitrogen (N) and fluorine (F) doping and yields a nitrogen-doped carbon layer (NCL) coating on Pt nanoparticles with an average size of only 3.4 nm. Compared with conventional Pt–C catalysts, Pt@NCL-MXene exhibits a larger specific surface area, enhanced electron transfer efficiency, and an optimized d-band center, thereby facilitating both H* adsorption and desorption. As a result, Pt@NCL-MXene achieves a significantly lower overpotential of 73 mV at a current density of 100 mA cm–2, alongside improved kinetics and stability under operational conditions. Furthermore, the 9 wt % F-rich MXene support effectively suppresses CO adsorption on Pt, reducing the CO uptake to 0.224 mmol g–1, which is purportedly lower than that of Pt–C (0.264 mmol g–1), thereby mitigating CO poisoning and prolonging the catalyst’s service life. These findings offer insights into the rational design of advanced CO-resistant Pt-based HER electrocatalysts.
✓ 已验证
产品关联
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2018
·Vol. 20
·期 22
·15192-15202
·
IF 3.906
Jinggao Wu,Maowen Xu,Chun Tang,Guannan Li,Hong He,Chang Ming Li
F-Doping effects on polyaniline-derived carbon coated Li3V2(PO4)3 (Li3V2(PO4)3−xFx@C) as a cathode for high performance Li rechargeable batteries are systematically investigated with a combined experimental and DFT theoretical calculation approach. The results clearly indicate that the doping amount has a significant impact on the rate capability and long cycle life. The optimal material (Li3V2(PO4)2.88F0.12@C) delivers 123.16 mA h g−1@2C, which is close to the theoretical value (133 mA h g−1), while showing a greatly improved cycle stability. Rietveld refinements show that the F− doping does not obey Vegard's Law, which may be attributed to the generated lower valence of V ions. AC impedance spectroscopy shows that the F-doping can achieve faster interfacial charge transfer for higher reaction reversibility. DFT calculations confirm that the lower V2+ (t2g↑)3 does exist in Li3V2(PO4)2.88F0.12, and the mean nearest neighbor Li–O bond length also increases for faster electrochemical kinetics, and further reveal that there is a tendency for a transition from the insulator to the n-type semiconductor due to the F dopant. The combined experimental and calculated results suggest that F-doping indeed greatly facilitates the charge transfer rate of the Li+ insertion/de-insertion process for better reversibility and enhances the Li+ diffusion rate to access the reaction sites, thus resulting in high rate capacity and cycling stability. This work not only offers a facile and effective approach to synthesize high performance Li-ion battery material for very promising practical applications, but also discloses scientific insights on element coating and doping to guide the electrode material design for fast electrode kinetics in energy storage devices.
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2020
·Vol. 103
·期 10
·5664-5677
·
IF 3.502
Yao Ji,Yongbao Xiao,Shujing Huang,Weichao Wang
Fluoro-sulfo-phosphate (FPS) glass is of current interest as potential material for laser application due to its good glass-forming ability, thermal, and chemical stability as well as the complicated local environment for incorporated species. Herein, the physical and luminescent properties of Er 3+ and Yb 3+ /Er 3+ -doped FPS glasses vs S/F ratio are investigated comprehensively. The low melting temperature (750°C) leads to fewer ingredients evaporation and easier operation. The sulfate addition depolymerizes the structure of FPS glasses, leading to either monotonic or nonmonotonic variations of physical properties, while no deterioration in thermal and limited one in chemical stability is caused. The addition of sulfate also modifies the local structure around optical active species and thus, leading to higher emission cross section (1.52 × 10 −20 cm 2 ), effective linewidth (68.4 nm), figure of merit (5.61 × 10 −23 s cm 2 ), gain bandwidth (102.44 × 10 −27 cm 3 ), and energy-transfer microparameters (51.87 × 10 −39 cm 6 /s), implying high possibility to serve as 1.5 μm laser application.
研究领域:
材料科学
·
光学
·
激光物理
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）